Would a performance chip or an exaust leak at the manifold cause a trouble cods p0405? This isbmy second EGR valve.

Asked by Jun 23, 2015 at 05:42 AM about the 1999 GMC Sierra 1500 SLE Standard Cab SB

Question type: Maintenance & Repair

2 Answers

88,785

Your code is a low voltage signal for EGR so check the wiring from the EGR to the ECM, so somewhere the 5 volts to or the signal voltage from the EGR is dropping too low, look for any rubbed through spots, corrosion in connectors, pay very close attention to the grounds, the computer controls need to have a good grounds, weak or missing ones can cause you all kinds of misery.

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42,015

What kind of performance chip?

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